Problem with starting postfix .(linux level2 task 14)

I have this in my main.cf

but still I see this error message when starting postfix with 'systemctl start postfix`

unable to find local interfaces

What did I do wrong here ?

Seek, and ye shall find :slight_smile:

This user found a solution in this chain of posts.

oke, got now another problem.
I did all the steps and I can see that dovecot recieved the mail

but still I see this message :

 Mail not recieved!, 'dovecot' is not configured correctly on Mail Server

Any hint what can be wrong or is maybe the check function here wrong ?

Tried eveything in the forum but still a failing challenge.

Anyone who can help ?